So to get started open the settings on your phone and select Accounts and Sync
Settings
Settings

Click Add Account
Add Server
Add Server

Select Microsoft Exchange Active Sync
Microsoft Exchange Active Sync
Microsoft Exchange Active Sync


Enter Information (DSM Specific Below)
Email: <email address>
Password: <email password>
Domain: <email address>
Exchange Server: secure.dsmhosting.net

Server Settings
Server Settings

Click Next and your phone will connect to BPOS
Next
Next

Accept the warning that BPOS will now 'own' your phone
Security warning
Security warning

Lastly configure how often you want to synchronise your email, or if you want to use push email
Finish off
Finish off